Tombaugh

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21	Journal of Scienti c Exploration, Vol. 13, No. 4, pp. 685–694, [removed]99 Add to Reading List Source URL: www.scientificexploration.org Language: English - Date: 2008-12-14 21:42:18 Ufologists Unidentified flying objects Clyde Tombaugh Northern Arizona University alumni Pluto Lincoln LaPaz Donald Keyhoe Green fireballs Extraterrestrial hypothesis Pseudoscience Ufology Astronomy
22	PDF Document Add to Reading List Source URL: assets.cambridge.org Language: English - Date: 2004-10-11 13:21:55 Pluto Planets beyond Neptune Clyde Tombaugh Kuiper belt Neptune Planet Charon Lowell Observatory Percival Lowell Astronomy Planetary science Solar System